chore: Remove amannn/action-semantic-pull-request job from PR workflow

[khvn26]

Summary

• Remove the lint-pr-title job from pr.yml that used amannn/action-semantic-pull-request
• Remove edited trigger type (only needed for PR title validation)
• This check is now handled by the Flagsmith GitHub App webhook handler

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@e97821f). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff            @@
##             main        #7   +/-   ##
========================================
  Coverage        ?   100.00%           
========================================
  Files           ?         4           
  Lines           ?       111           
  Branches        ?         0           
========================================
  Hits            ?       111           
  Misses          ?         0           
  Partials        ?         0           

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